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- Deploy 12642
- Overview Deploying DuckDB-Wasm means serving its components so that the browser can fetch and instantiate them. This page describes each component a deployment needs to serve, how the worker and WebAssembly variants relate, how extensions a
...kdb/duckdb-wasm package. You can deploy it in one of three ways: Bundled together with your application Served from a same-origin (sub-)domain and included at runtime Served from a third-party CDN such as jsDelivr It cannot be served as-is: it requires...mbly with exception handling and threading, which enables parallel query execution; it requires the deployment to be cross-origin isolated (see Cross-Origin Isolation ) You can serve all three and let the library feature-detect the best one with select...m content type so the browser can compile them efficiently. Host them anywhere reachable from the main document — the same origin or an arbitrary [sub-]domain. The main library component is told each module's location through the bundle definition (the... - https://man.mtool.work/duckdb/2.0/clients/wasm/deploying_duckdb_wasm.html
- Instantiate 11682
- Overview DuckDB-Wasm can be instantiated in several ways, depending on how your application bundles and serves its assets. Each approach resolves the mainModule (the WebAssembly file) and the mainWorker (the worker script) for the browser's
...oids emulating them through JavaScript coi — adds threading for parallel query execution; it requires the page to be cross-origin isolated and must be opted into explicitly (see Threading ) The examples below all call selectBundle so the browser receiv...les hosted on jsDelivr , and selectBundle picks the one that matches the browser. Because a Web Worker script must be same-origin, the CDN worker URL is wrapped in a Blob that importScripts it, and the temporary object URL is revoked once the worker ha...lly download the distribution files from https://cdn.jsdelivr.net/npm/@duckdb/duckdb-wasm/dist/ , serve them from your own origin, and point the bundle paths at those locations. This keeps every asset on your own server, which suits offline, air-gapped... - https://man.mtool.work/duckdb/2.0/clients/wasm/instantiation.html
- Troubleshoot 10224
- Overview This page collects common issues encountered when using DuckDB-Wasm, together with their workarounds. If you run into a problem that is not covered here, search the duckdb-wasm issue tracker on GitHub. Network Error When Querying R
...wser's CORS policy and every request is upgraded to HTTPS. The server hosting the data must allow (using CORS headers) the origin that hosts the DuckDB-Wasm instance to read it. If the server does not send the required headers, the query fails with a n...cket's CORS policy to allow GET and HEAD requests: [ { "AllowedHeaders": ["*"], "AllowedMethods": ["GET", "HEAD"], "AllowedOrigins": ["*"], "ExposeHeaders": [], "MaxAgeSeconds": 3000 } ] This array is a server-side bucket configuration (for Amazon S3,...s still experimental. The threaded bundle relies on SharedArrayBuffer , which browsers only expose to pages that are cross-origin isolated . If the top-level document is not served with the Cross-Origin-Embedder-Policy and Cross-Origin-Opener-Policy he... - https://man.mtool.work/duckdb/2.0/clients/wasm/troubleshoot.html
- Indexing 9050
- DuckDB uses 1-based indexing except for JSON objects , which use 0-based indexing. Examples The index origin is 1 for strings, lists, etc. SELECT list[1] AS element FROM (SELECT ['first', 'second', 'third'] AS list); ┌─────────┐ │ element │
...│ varchar │ ├─────────┤ │ first │ └─────────┘ The index origin is 0 for JSON objects. SELECT json[1] AS element FROM (SELECT '["first", "second", "third"]'::JSON AS json); ┌──────────┐... - https://man.mtool.work/duckdb/2.0/sql/dialect/indexing.html
- Timestamp with Time Zone Functions 8304
- This section describes functions and operators for examining and manipulating TIMESTAMP WITH TIME ZONE (or TIMESTAMPTZ ) values . See also the related TIMESTAMP functions . Time zone support is provided by the built-in ICU extension . In th
...its, else 2000-01-03 00:00:00+00:00[ + offset] . Note that 2000-01-03 is a Monday. time_bucket(bucket_width, timestamptz[, origin]) Truncate timestamptz to a grid of width bucket_width . The grid is anchored at the origin timestamp, which defaults to 2...(bucket_width, timestamptz[, timezone]) Truncate timestamptz to a grid of width bucket_width . The grid is anchored at the origin timestamp, which defaults to 2000-01-01 00:00:00 in the provided timezone when bucket_width is a number of months or coars...92-04-20 15:26:00-07', INTERVAL '5 minutes') | | Result | 1992-04-20 15:25:00-07 | time_bucket(bucket_width, timestamptz[, origin]) | Description | Truncate timestamptz to a grid of width bucket_width . The grid is anchored at the origin timestamp, whi... - https://man.mtool.work/duckdb/2.0/sql/functions/timestamptz.html
- Date Functions 8232
- This section describes functions and operators for examining and manipulating DATE values. Date Operators The table below shows the available mathematical operators for DATE types. Operator Description Example Result + addition of days (int
...f months or coarser units, else 2000-01-03[ + offset] . Note that 2000-01-03 is a Monday. time_bucket(bucket_width, date[, origin]) Truncate timestamptz to a grid of width bucket_width . The grid is anchored at the origin timestamp, which defaults to 2...ket(INTERVAL '2 months', DATE '1992-04-20', INTERVAL '1 month') | | Result | 1992-04-01 | time_bucket(bucket_width, date[, origin]) | Description | Truncate timestamptz to a grid of width bucket_width . The grid is anchored at the origin timestamp, whi... - https://man.mtool.work/duckdb/2.0/sql/functions/date.html
- Import Data 8090
- Overview DuckDB-Wasm has multiple ways to import data, depending on the format of the data. Importing happens in two steps. The data file is registered in a virtual file system using one of the register functions ( registerFileBuffer , regi
...tocol.BROWSER_FILEREADER, true); // Remote file, read lazily over HTTP await db.registerFileURL('remote.parquet', 'https://origin/remote.parquet', DuckDBDataProtocol.HTTP, false); // Bytes already fetched into memory const res = await fetch('https://or...remote file directly by putting its URL in the SQL text: await conn.query(` CREATE TABLE direct AS SELECT * FROM 'https://origin/remote.parquet' `); Tip Reading a remote file makes the browser issue the request, so it is subject to the browser's CORS... - https://man.mtool.work/duckdb/2.0/clients/wasm/data_ingestion.html
- Timestamp Functions 7859
- This section describes functions and operators for examining and manipulating TIMESTAMP values . See also the related TIMESTAMPTZ functions . Timestamp Operators The table below shows the available mathematical operators for TIMESTAMP types
...arser units, else 2000-01-03 00:00:00[ + offset] . Note that 2000-01-03 is a Monday. time_bucket(bucket_width, timestamp[, origin]) Truncate timestamp to a grid of width bucket_width . The grid is anchored at the origin timestamp, which defaults to 200...P '1992-04-20 15:26:00-07', INTERVAL '5 minutes') | | Result | 1992-04-20 15:25:00 | time_bucket(bucket_width, timestamp[, origin]) | Description | Truncate timestamp to a grid of width bucket_width . The grid includes the origin timestamp, which defau... - https://man.mtool.work/duckdb/2.0/sql/functions/timestamp.html
- Backup Extension Repositories 7575
- The core and community extension repositories have backup servers (see duckdb-backup.org ): Repository Primary server Backup server core http://extensions.duckdb.org http://extensions.duckdb-backup.org community http://community-extensions.
...es. Repositories set via custom_extension_repository or INSTALL ... FROM '⟨url⟩' are used as-is. The installed extension's origin is still recorded as core or community . Using the Backup Server Manually To always install core extensions from the backu... - https://man.mtool.work/duckdb/2.0/operations_manual/backup_extension_repositorie...
- DuckDB Wasm Client 7130
- Installation To use the DuckDB Wasm client, visit the duckdb-wasm GitHub repository . The latest stable version of the DuckDB WebAssembly client is 2.0.0. DuckDB-Wasm is a version of DuckDB that has been compiled to WebAssembly , the portab
...om a jsDelivr bundle const bundle = await duckdb.selectBundle(duckdb.getJsDelivrBundles()); // Worker scripts must be same-origin, so wrap the CDN worker in a Blob URL const worker_url = URL.createObjectURL( new Blob([`importScripts("${bundle.mainWorke... - https://man.mtool.work/duckdb/2.0/clients/wasm/overview.html
DuckDB 2.0 Documentation / man.mtool.work